Method of testing a fuel injection valve for a diesel engine

Abstract

Method of testing a fuel injection valve 1 for a diesel engine by supplying pressurized oil to the inlet side of the valve. According to the invention the oil pressure is gradually recorded, the pressure increase being interrupted at the moment when the opening pressure of the valve is exceeded, which is noted by a drop in the pressure on the inlet side. At the same time the opening pressure is recorded. As a result a more lenient test method is provided, which also can be used in connection with newly developed injection valves.

1. Method for testing a fuel injection valve ( 1 ) for a comparatively large diesel engine, by supplying pressurised oil to the inlet side of the valve ( 1 ), by which method the oil pressure on the inlet side gradually increases while being recorded, characterised in that the pressure increase is electronically momentarily interrupted at the moment when the opening pressure of the valve ( 1 ) is exceeded, corresponding to the pressure on the inlet side dropping, a compressed air supply for providing the oil pressure on the inlet side being electronically momentarily interrupted at that moment, whereafter the opening pressure is used to decide whether the injection valve in its present state is suitable for use in the engine.